Implementation of the Predictive Current Control of Multi-Pulse Flexible Topology Thyristor Rectifier Under Unbalanced Source Voltages
Zhang Damin1, *, Wang Shitao2, Kang Shaobo1, Zhang Ji1
High-voltage Key Laboratory of Fujian Province, Xiamen University of Technology, China
State Grid of China Technology College, Shandong Province, China
Predictive current control strategy has captured much concern recently in power converters. As for the multi-pulse flexible-topology thyristor rectifiers (m-PFTTR), the symmetry of the input line-to-line voltages has great influence upon the implementation of the control strategy. Existing literatures have mainly focused on the implementation under ideal condition, i.e., the input line-to-line voltages, being critical to the predictive current controller, were supposed to be symmetrical. In fact, the unbalance of the input line-to-line voltages usually exists in the windings of the zigzag transformer at front end and the A/D converter of the digital signal processor (DSP). This paper presents a new method to dynamically regulate the input line-to-line voltages to ensure the symmetry of each other. It is realized through the instantaneous correction of the bias values in the course of sampling, and the correction is embodied in the modified control algorithm. The paper includes analyses of the m-PFTTR as well as the control algorithm, simulation and experiments. Simulation and experimental results demonstrate the effectiveness of the presented method.
Keywords: Dynamic correction, Predictive current control, Multi-pulse flexible-topology thyristor rectifier, Loop modeling and simulation.
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* Address correspondence to this author at the Xiamen University of Technology, No.600, Ligong Road, Jimei, Xiamen, China; Tel: +8615659283976; E-mail: firstname.lastname@example.org